Perhaps you should try some spelling variations:
thong cong » trong cong, tong cong, thong thong
hanh trung » thanh trung, hanh trang, manh trung
hoc thieu » toc thieu
trung cua » truong cua, trung tuan, trung cap
cua thong » cua thuong, cua khong, cua tong
than tap » toan tap, han tap, than cap
phan tap » phan lap, han tap, pha tap

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc thieu) OR (hoc hien)) xanh - hanh trung cua thong cong trinh ((than tap) OR (phan tap))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((hoc thieu) or (hoc hien)) xanh - hanh trung cua thong cong trinh ((than tap) OR (phan tap))~".
• Adding a wildcard symbol may retrieve word variants: ((hoc thieu) or (hoc hien)) xanh - hanh trung cua thong cong trinh ((than tap) OR (phan tap))*.